Thursday, May 17, 2007

Vector Data Vs. Raster Data

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Vector Data

  • Represented by point, line and polygon.
  • Relatively small file size (small data volume)
  • Excellent representation of networks.
  • A large no. of attributes can be attached, hence more information intensive and a number of thematic maps can be prepared from a single layer.
  • Features are more detailed & accurate.
  • Creating, cleaning and updating data is more time and labour consuming.
  • Topology-based analysis & operations are easier to perform (like network analysis etc.).
  • Can not represent continuous values like land use, elevation etc very well.
  • Assigning projection and transformations are less time taking and consumes less memory of the computer system.
  • Topology makes data structure complex.

Raster Data

  • Points, line & polygons everything in the form of Pixels.
  • Large file size.
  • Networks are not so well represented.
  • Only one pixel value represents each grid cell.
  • Generalization of features (like boundaries) hence accuracy may decrease.
  • Simulations and modeling is easier (spatial analysis, terrain modeling etc.).
  • Maintaining is easier.
  • Excellent for representing data containing continuous values (like land use, elevation etc.)
  • Coordinate-system transformations take more time and consume a lot of memory.
  • Grid cells or pixel makes simpler data structure.
Please see INDEX for complete list of topics


ritu said...

really helpful!!!!!!!!

ritu said...

doesn't raster get distorted on enlargement????